Abstract: A formable biodegradable filament nonwoven fabric and a production method therefor are provided. A biodegradable polymer comprising a thermoplastic aliphatic polyester as its principal component is melted and extruded through a spinneret into filaments. While being quenched with quench air blow, the extruded filaments are drafted at a drafting speed of 1,000 to 2,500 m/min by means of a suction device disposed below the spinneret. The drafted filaments are spread and accumulated on a movable collector surface thereby to be formed into a web, which is then treated for formation of a nonwoven fabric. The constituent filaments of the nonwoven fabric has a polymer supercool index of 0.3 to 0.6.

Abstract: A biodegradable filament nonwoven fabric is provided which is composed of filaments of a polylactic acid based polymer. The polylactic acid based polymer is selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid, copolymers of D-lactic acid and a hydroxycarboxylic acid, copolymers of L-lactic acid and a hydroxycarboxylic acid, and copolymers of D-lactic acid, L-lactic acid and a hydroxycarboxylic acid, which have melting points of not lower than 100° C., and blends of any of these polymers which have melting points of not lower than 100° C. The filaments of the polylactic acid based polymer have a birefringence of 10×10−3 to 25×10−3, a degree of crystallinity of 12 to 30 wt %, and a crystal size of not greater than 80 Å as measured axially of the filaments. The nonwoven fabric has a boiling water shrinkage percentage of not higher than 15%.

Abstract: A biodegradable filament nonwoven fabric is provided which is composed of filaments of a polylactic acid based polymer. The polylactic acid based polymer is selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid, copolymers of D-lactic acid and a hydroxycarboxylic acid, copolymers of L-lactic acid and a hydroxycarboxylic acid, and copolymers of D-lactic acid, L-lactic acid and a hydroxycarboxylic acid, which have melting points of not lower than 100° C., and blends of any of these polymers which have melting points of not lower than 100° C. The filaments of the polylactic acid based polymer have a birefringence of 10×10−3 to 25×10−3, a degree of crystallinity of 12 to 30 wt %, and a crystal size of not greater than 80 Å as measured axially of the filaments. The nonwoven fabric has a boiling water shrinkage percentage of not higher than 15%.

Abstract: A nonwoven fabric of superior uniaxial elasticity is provided. The nonwoven fabric comprises of conjugate filaments each of which is about concentric sheath-core type. Core component is composed of polyester and sheath component is composed of polyolefine. In the nonwoven fabric, heat bonded areas are interspersed by heat bonding the conjugate filaments one another by softening or melting the sheath component. The nonwoven fabric satisfies following four properties concurrently: (i) breaking elongation in cross direction is 150% or more, (ii) ratio of breaking elongation in cross direction to breaking elongation in machine direction is 5 or more, (iii) percentage of elastic recovery at the time of extending the nonwoven fabric by 50% in cross direction is 60% or more, and (iv) percentage of elastic recovery at the time of extending the nonwoven fabric by 100% in cross direction is 50% or more. A heat is partially applied to a filamentous web, thereby obtaining a filamentous fleece.

Abstract: The present invention relates to a nonwoven fabric including a fine denier filament having a plexifilamentary structure in which the disadvantages of polyolefins and of polyesters are offset each other while advantages of them are well utilized with a fine fibrillated structure comprising said filament. The filament comprises a mixture which is at least composed of polyolefin and polyester which are immiscible with each other and has a plexifilamentary structure. The filament is so highly fibrillated that the fibril has not been available yet and, in addition, the filament is with high strength and modulus and exhibits a good dyeing ability. The above-mentioned nonwoven fabric contains the filaments having a plexifilamentary structure in which a mixture of polyolefin and polyester which are immiscible with each other in a mixing ratio within a range of from 5/95 to 95/5 by weight and said filaments are entirely or partially bonded.

Abstract: The present invention relates to a nonwoven fabric including a fine denier filament having a plexifilamentary structure in which the disadvantages of polyolefins and of polyesters are offset each other while advantages of them are well utilized with a fine fibrillated structure comprising said filament. The filament comprises a mixture which is at least composed of polyolefin and polyester which are immiscible with each other and has a plexifilamentary structure. The filament is so highly fibrillated that the fibril has not been available yet and, in addition, the filament is with high strength and modulus and exhibits a good dyeing ability. The above-mentioned nonwoven fabric contains the filaments having a plexifilamentary structure in which a mixture of polyolefin and polyester which are immiscible with each other in a mixing ratio within a range of from 5/95 to 95/5 by weight and said filaments are entirely or partially bonded.

Abstract: The present invention provides a nonwoven fabric made of fine denier filaments of superior bulkiness, heat insulation property and tensile strength, and a production method thereof. This nonwoven fabric is made of fine denier filaments produced by first preparing. First a thermoplastic polymer component "A", then another thermoplastic polymer component "B" which is insoluble in the component "A" and of which the melting point is higher than that of the component "A" by 30.degree. to 180.degree. C. Adopting a bicomponent melt spinning method employing the component "A" and the component "B", the bicomponent conjugate filaments, on which surface at least component "A" is exposed, are obtained. By accumulating these bicomponent conjugate filaments, a web is formed. Then heat is applied to the predetermined areas on the web throughout its entire thickness, whereby only the component A is softened or molten, and the bicomponent conjugate filaments are heat bonded to one another, thus a fleece is obtained.

Abstract: A biodegradable filament nonwoven fabric comprising a nonwoven web made up of filaments, each filament comprising a high melting point component composed of a first aliphatic polyester having biodegradability and a low melting point component composed of a second aliphatic polyester having biodegradability with a melting point lower than that of the high melting point component, the nonwoven web processed to a predetermined nonwoven fabric configuration. At least one of the high melting point component and the low melting point component is arranged in a plurality of divisions within the cross section of the filament. Both the high melting point component and the low melting point component extend continuously in the axial direction of the filament and are exposed on the surface of the filament. A method for manufacturing the biodegradable filament nonwoven fabric is also disclosed herein.

Abstract: A nonwoven fabric formed of highly spinnable heat bonded continuous filaments which is strong and soft and is superior in hand. The nonwoven fabric is formed by heat-bonding filaments of linear low density polyethylene so that the number of defects is not more than 0.01/kg, the weight is 10-100 g/m.sup.2, the percentage bond area is 7-20% and the total hand value is 4-300 g. The nonwoven fabric is produced by melt-extruding the above-mentioned linear low density polyethylene to form filaments which are drawn by air guns at a high speed so that they are deposited on a moving collection belt to form a web which is then heat treated at a temperature 15.degree.-30.degree. C. lower than the melting point of the filaments. The nonwoven fabric an be formed of filaments of hollow or flat cross section. It is also possible to utilize bicomponent filaments having a sheath component made of linear low density polyethylene and a core component made of polyethylene terephthalate.

Abstract: A nonwoven fabric formed of highly spinnable heat bonded continuous filaments which is strong and soft and is superior in hand. The nonwoven fabric is formed by heat-bonding filaments of linear low density polyethylene so that the number of defects is not more than 0.01/kg, the weight is 10-100 g/m.sup.2, the percentage bond area is 7-20% and the total hand value is 4-300 g. The nonwoven fabric is produced by melt-extruding the above-mentioned linear low density polyethylene to form filaments which are drawn by air guns at a high speed so that they are deposited on a moving collection belt to form a web which is then heat treated at a temperature 15.degree.-30.degree. l C. lower than the melting point of the filaments. The nonwoven fabric an be formed of filaments of hollow or flat cross section. It is also possible to utilize bicomponent filaments having a sheath component made of linear low density polyethylene and a core component made of polyethylene terephalate.

Abstract: A biconstituent fiber having good spinnability, a binder fiber made thereof, and a nonwoven fabric produced therefrom and which has high tensile strength and comfortable soft touch are provided. The biconstituent fiber is composed of linear low-density polyethylene and crystalline polypropylene and may be hollow or flat in cross section. A binder fiber may be produced from a bicomponent structure in which the biconstituent fiber serves as a sheath component and polyethylene terephthalate as a core component.

Abstract: A benzene polycarboxylic acid represented by the formula: ##STR1## wherein n is an integer of 2 or 3, can be obtained under mild conditions with a high yield and with scarce formation of by-product by reacting a monochlorobenzene polycarboxylic acid represented by the formula: ##STR2## wherein n is an integer of 2 or 3, or its alkali metal salt with carbon monoxide in an aqueous solution of an alkali metal compound in the presence of a carbonylation catalyst with irradiation of ray of 340-400 nm, and subsequently acidifying the reaction solution.

Abstract: A method for preparing a novel compound, i.e. a resinous material, characterized in that an epoxy compound is allowed to react with ammonium salt or a metal salt (for example, lithium salt, sodium salt, potassium salt, magnesium salt, etc.) of polyglutamic acid. The resulting reaction product is useful in a method for treating shaped materials especially polyester textiles. In this method the shaped materials are treated with the novel resinous material to improve the appearance and handling characteristics thereof. A process for providing a wooly finish on polyester textiles is characterized by treating textiles (including polyester knittings and mixed spun fabrics or knittings or mixed woven fabrics or knittings) in a bath of an emulsified mixed solution of an epoxy compound and a metal salt of polyglutamic acid containing a catalyst, and carrying out a heat-treatment of the resulted textiles after pre-drying.

Abstract: A method for preparing a novel compound, i.e. a resinous material, characterized in that an epoxy compound is allowed to react with ammonium salt or a metal salt (for example, lithium salt, sodium salt, potassium salt, magnesium salt, etc.) of polyglutamic acid. The resulting reaction product is useful in a method for treating shaped materials especially polyester textiles. In this method the shaped materials are treated with the novel resinous material to improve the appearance and handling characteristics thereof. A process for providing a wooly finish on polyester textiles is characterized by treating textiles (including polyester knittings and mixed spun fabrics or knittings or mixed woven fabrics or knittings) in a bath of an emulsified mixed solution of an epoxy compound and a metal salt of polyglutamic acid containing a catalyst, and carrying out a heat-treatment of the resulted textiles after pre-drying.